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- Aarnio, Harri, et al.
(author)
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Recombination studies in a polyfluorene copolymer for photovoltaic applications
- 2005
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In: Synthetic Metals. - : Elsevier BV. - 0379-6779. ; 155:2, s. 299-302
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Journal article (peer-reviewed)abstract
- We present detailed continuous wave (cw) and transient photoinduced absorption (PA) measurements in thin films of a novel alternating polyfluorene copolymer, poly[2,7-(9,9-dioctyl-fluorene)-alt-5,5-(4',7'-di-2-thienyl-2',1',3-benzo-thiadiazole)] (DiO-PFDTBT), and its blends with the sol. fullerene deriv. [6,6]-phenyl-C61-butyric acid Me ester (PCBM) in wt. ratios of 1:0, 4:1 and 1:4. We measure the frequency, intensity and temp. dependence of the PA signal in the frequency domain, and compare with the results obtained from the transient PA decay measurements in the time domain. In all blends, the PA spectrum shows a broad high energy PA band ranging from .apprx.1 eV to 2 eV as well as a low energy band peaking at .apprx.0.35 eV. We attribute the low energy band to the P1 transition of polarons and part of the high energy band to the correlated P2 transition of polarons. Both frequency and time domain measurements show that the high energy band has two decay components, a faster component in the microsecond time regime and a slower component in the millisecond time regime. The slow component is strongly dispersive, whereas the fast component is practically non-dispersive. [on SciFinder (R)]
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| 2. |
- Andersson, Annika, 1961-, et al.
(author)
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Challenges in project management : Grabbing the elephant
- 2007
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In: Projects & Profits. ; 7:12, s. 33-37
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Journal article (peer-reviewed)abstract
- Projects and project management tend to have special meanings to the individuals involved in a specific line of research. This article reports on some topics covered in an informal Swedish network devoted to study project management. Ten topics are selected for discussion that fall into three broad categories—projects as practice, productivity in projects and education in a PM curriculum.
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| 3. |
- Andersson, Bo, Docent, 1965-, et al.
(author)
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File-Sharing : A Threat to Intellectual Property Rights, or is the Music Industry Just Taking Us for a Spin?
- 2009
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In: In proceedings of the 17th European Conference on Information Systems (ECIS). - : Association for Information Systems.
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Conference paper (peer-reviewed)abstract
- File-sharing has become synonym with the “digital economy” where large music conglomerates as well as certain artist voice strong concern over the impact on their bottom line. This research analyzes the music industry, which has been heavily impacted by a major technological shift i.e. the invention, and rollout, of the Internet. We look to the technological shift that has enabled the downloading phenomenon, as well as analyze the uniqueness of the music industries situation. By comparing the book publishing industry as well as the software industry, which are arguably also influenced by intellectual property rights and plagiarism, we try to find similarities as well as dissimilarities with the music industry. We find that the music industry has used alliances as well as Mergers and Acquisitions in order to consolidate their positions in an attempt to slow down change. There is no consensus on the exact extent of ill effects of file sharing. We point to an unwillingness to achieve convergence of purpose between the IT-community and the much of the music industry. Finally we point to the historical fact that consumers always get what they want in the end, which should indicate a need to find a viable e-commerce solution.
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| 6. |
- Andersson, Markus, 1981
(author)
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Imidazole containing polymers complexed with Cu2+ and Zn2
- 2009
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Licentiate thesis (other academic/artistic)abstract
- An enormous problem for the shipping industry is fouling of marine organisms such as algae andbarnacles on the boat hull. The negative consequences for the society are both economical as well asenvironmental. To prevent fouling in general, biocides are typically incorporated directly into the paint.Premature leakage of the biocides is a drawback which reduces the lifetime of the coating and pollutes thesurrounding ecosystems.Microencapsulation is an efficient way of encapsulating active substances for controlling the release andthereby prolonging the antifouling properties of the coating. The rate of release into the marineenvironment is partly governed by the degree of swelling of the shell of the microcapsule. The swelling ofthe microcapsule shell, and hence the release of biocide, may be modified by utilizing imidazolecoordination chemistry towards metal ions in the shell material.The aim of this thesis has been to characterize such coordinating polymer complexes and evaluate theirmaterial properties, solubility characteristics and coordination chemistry as well as synthesising newmaterials. Furthermore it is of interest to outline the coordination properties of imidazole as a function ofsubstitution position since synthetic and natural imidazole ligands in polymers are typically substituted atposition 1 or 4.The coordinating polymer material was studied using DSC, mid-FTIR and far-FTIR vibrationalspectroscopy as well as simple ocular investigation. The coordination chemistry of the coordinatingpolymer material and related coordination compounds were evaluated by far-FTIR and EPR.The reaction between the polymer and the metal ions Cu2+ and Zn2+ cross-links the system and increasesthe glass transition temperature, Tg. Furthermore, the strong coordinate bond between imidazole and themetal ions in the cross-links renders the complex insoluble in conventional solvents, and only stronglycoordinating solvents are able to solubilise the complex. The geometry of the Cu2+ complexes is squareplanar with up to four imidazole ligands and the physical properties of corresponding the Zn2+ complexesindicate a higher coordination number. The metal ions are exclusively coordinated by the imidazole ligandin the polymer. Concerning the effect of ring substitution on the coordination chemistry of imidazole, theresults indicate that the inductive effect of the group attached has a much larger effect than the position ofthe group.ivDue to the significant strength of the coordinate bond, coordination of imidazole by Cu2+ or Zn2+ is anefficient way of almost irreversibly incorporating salts into a hydrophobic polymer material. Polymerscoordinated by metal ions provide the resulting coordinating polymer complex with new materialproperties. The specific aim of this doctoral project is to use these polymer materials to modify the shellof the microcapsule in order to control the rate of release. Due the strongly hygroscopic nature of salts,the tendency for the shell material to swell by water should be significantly enhanced. The contact with seawater will accordingly act as a trigger for release.
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| 7. |
- Broström, Markus, 1977-, et al.
(author)
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Sulfation of corrosive alkali chlorides by ammonium sulfate in a biomass fired CFB boiler
- 2007
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In: Fuel processing technology. - Amsterdam : Elsevier Bv. - 0378-3820 .- 1873-7188. ; 88:11-12, s. 1171-1177
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Journal article (peer-reviewed)abstract
- Biomass and waste derived fuels contain relatively high amounts of alkali and chlorine, but contain very little sulfur. Combustion of such fuels can result in increased deposit formation and superheater corrosion. These problems can be reduced by using a sulfur containing additive, such as ammonium sulfate, which reacts with the alkali chlorides and forms less corrosive sulfates. Ammonium sulfate injection together with a so-called in situ alkali chloride monitor (IACM) is patented and known as "ChlorOut". IACM measures the concentrations of alkali chlorides (mainly KCl in biomass combustion) at superheater temperatures. Tests with and without spraying ammonium sulfate into the flue gases have been performed in a 96MW(th)/25MW(e) circulating fluidized bed (CFB) boiler. The boiler was fired mainly with bark and a chlorine containing waste. KCl concentration was reduced from more than 15 ppm to approximately 2 ppm. during injection of ammonium sulfate. Corrosion probe measurements indicated that both deposit formation and material loss due to corrosion were decreased using the additive. Analysis of the deposits showed significantly higher concentration of sulfur and almost no chlorine in the case with ammonium sulfate. Results from impactor measurements supported that KCl was sulfated to potassium sulfate by the additive. (C) 2007 Elsevier B.V. All rights reserved.
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| 9. |
- Davidsson, Josef, et al.
(author)
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Tiling resolution array comparative genomic hybridization, expression and methylation analyses of dup(1q) in Burkitt lymphomas and pediatric high hyperdiploid acute lymphoblastic leukemias reveal clustered near-centromeric breakpoints and overexpression of genes in 1q22-32.3
- 2007
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In: Human Molecular Genetics. - : Oxford University Press (OUP). - 0964-6906 .- 1460-2083. ; 16:18, s. 2215-2225
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Journal article (peer-reviewed)abstract
- Although gain of 1q occurs in 25% of Burkitt lymphomas (BLs) and 10% of pediatric high hyperdiploid acute lymphoblastic leukemias (ALLs), little is known about the origin, molecular genetic characteristics and functional outcome of dup(1q) in these disorders. Ten dup(1q)-positive BLs/ALLs were investigated by tiling resolution (32k) array CGH analysis, which revealed that the proximal breakpoints in all cases were near-centromeric, in eight of them clustering within a 1.4 Mb segment in 1q12-21.1. The 1q distal breakpoints were heterogeneous, being more distal in the ALLs than in the BLs. The minimally gained segments in the ALLs and BLs were 57.4 Mb [dup(1)(q22q32.3)] and 35 Mb [dup(1)(q12q25.2)], respectively. Satellite 11 DNA on 1q was not hypomethylated, as ascertained by Southern blot analyses of 15 BLs/ALLs with and without gain of 1q, indicating that aberrant methylation was not involved in the origin of dup(1q), as previously suggested for other neoplasms with 1q rearrangements. Global gene expression analyses revealed that five genes in the minimally 57.4 Mb gained region-B4GALT3, DAP3, RGS16, TMEM183A and UCK2-were significantly overexpressed in dup(1q)-positive ALLs compared with high hyperdiploid ALLs without dup(1q). The DAP3 and UCK2 genes were among the most overexpressed genes in the BL case with gain of 1q investigated. The DAP3 protein has been reported to be highly expressed in invasive glioblastoma multiforme cells, whereas expression of the UCK2 protein has been correlated with sensitivity to anticancer drugs. However, involvement of these genes in dup(1q)-positive ALLs and BLs has previously not been reported.
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